Your system information

• Steam client version (build number or date): 1773367340
• Distribution (e.g. Ubuntu): CachyOS
• Opted into Steam client beta?: [Yes/No]Yes
• Have you checked for system updates?: [Yes/No]Yes
• Steam Logs:
  steam-logs.tar.gz
• GPU: AMD RX 6700 10GB

Please describe your issue in as much detail as possible:

When you have custom proton runners installed like GE-Proton, CachyOS-Proton, Proton-EM etc, steam will spit out some errors that KDE Plasma shows as fatal for steam.

the error that causes this to appear is this from steams logs

Proton: Upgrading prefix from GE-Proton10-32 to EM-10.1000-202 (/home/linuxnext2/.local/share/Steam/steamapps/compatdata/0/)
Proton: Prefix has an invalid version?! You may want to back up user files and delete this prefix.
ProtonFixes[55397] WARN: Skipping fix execution. We are probably running a unit test.

When i delete the 0 prefix it will get recreated aswell so the error just keeps popping up every time you launch steam unless you uninstall these custom proton runners.

Steps for reproducing this issue:

1. Install a custom proton runner like GE-Proton from apps like protonplus
2. Run steam in terminal
3. Watch it do the same error as above + if using kde plasma it will do a pop up error aswell for steam